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We live day by day, but in the great things, the time of days and weeks ____ so small that a day is unimportant.
A.isB.areC.has beenD.have been
A
考查主谓一致。时间,金钱等做主语,谓语动词用单数,排除BD;本句没有必要使用完成时。故答案为A。
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